WD Catalog 2018

946 / 1003

11-3 - -
COOL OR WARM
AIR TO FRONT (CAB)
COOL OR WARM
AIR TO REAR
(SLEEPER)
BLOWER & MOTOR
ASSEMBLY
WATER VALVE
DRAIN TUBE
AIR INTAKE
EXPANSION VALVE
RESISTOR
EVAPORATOR
COIL
HEATER CORE
CONTROL
PANEL
MODE
SWITCH
UNIT FRONT VIEW SHOWS ACTIVE CONTROLS
TEMPERATURE CONTROL
AIR DIRECTION CONTROL
HEATER
INLET/
OUTLET
EXPANSION VALVE
BLOWER & MOTOR
ASSEMBLY
CONTROL
PANEL
Typical AC Systems and Components
Figure 11-4
An HVAC combination unit
designed to mount on the
panel behind the operators
seat. The vents direct air to
both the cab and rear com-
partment. Note how the
evaporator coil and heater
core are stacked, one over
the other. The valves and
connections are easy to
access for service.
HVAC UNIT
Figure 11-5
This combo HVAC unit is
designed to mount under
the dash and on a specific
truck series. In this case it’s
for the MACK “R” series.
Under-dash units blend into
the overall appearance of
the dash.
HVAC COMBINATION UNIT